A mixing machine for producing activated carbon

Abstract

The utility model relates to the technical field of activated carbon production, concretely to a mixing machine for activated carbon production, including bottom plate, the upper end fixedly connected with shell of bottom plate, one side of shell is provided with mixing jar, the surface of shell is provided with two drive mechanisms, two drive mechanisms all include rotary lever and servo motor, two servo motors all with the inner wall fixed connection of shell, the output end of servo motor is fixedly connected with one end of rotary lever, one end of two rotary lever all is fixedly connected with drive frame, two drive frames all with same mixing jar rotation is connected, the position of corresponding mixing jar of bottom plate upper end is connected with collecting box with sliding, both ends of collecting box all are provided with replacement device, the utility model discloses through the design replacement device and protection device, has solved the collecting box dismounting cumbersome, the problem of inconvenient operation.

Description

Technical Field

[0001] This utility model relates to the field of activated carbon production technology, and in particular to a mixer for activated carbon production. Background Technology

[0002] In the activated carbon production process, the mixer is used to fully, uniformly and efficiently mix the activated carbon raw materials with various binders, pore-forming agents and activators, so that the components achieve an ideal distribution at the microscale. This ensures that the final activated carbon product has uniform and consistent quality indicators in terms of specific surface area, adsorption performance, mechanical strength and pore structure, meeting the strict requirements of different application fields for the stability of activated carbon performance.

[0003] Existing technologies, such as the utility model patent with publication number CN216377496U, disclose a mixing device for activated carbon production, belonging to the field of activated carbon production technology. This mixing device includes a support frame, a mixing component, a water washing component, and a flushing component. The second stirring element has the same structure as the first stirring element and is installed side-by-side in the mixing tank. The nozzle is located at the bottom of the mounting plate and connected to the water pipe, and the air nozzle is located on both sides of the bottom of the mounting plate and connected to the air pipe. This utility model uses two sets of stirring elements to stir the production materials in the mixing tank, making the mixing of the production materials more uniform. The flushing component flushes away the ash adhering to the side wall of the mixing tank, which is discharged out of the mixing tank along with the production materials during discharge, avoiding the reduction of the mixed material. The water washing component washes away the ash adhering to the stirring rod and the inner wall of the mixing tank, making the cleaning of the inside of the mixing tank faster and more convenient.

[0004] When performing routine maintenance on the mixer or changing production batches, it is necessary to remove the collection box to clean the accumulated material inside. However, in typical mixers, the collection box is usually fixed directly with bolts or connected with clips, which requires tools and involves cumbersome procedures, resulting in low cleaning efficiency. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the cumbersome disassembly and assembly of collection boxes and the inconvenience of operation.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a mixer for activated carbon production, comprising a base plate, an outer shell fixedly connected to the upper end of the base plate, a mixing tank disposed on one side of the outer shell, two driving mechanisms disposed on the surface of the outer shell, each driving mechanism comprising a rotating rod and a servo motor, the servo motor being located inside the outer shell and its body fixed inside the outer shell, both servo motors being fixedly connected to the inner wall of the outer shell, the output end of the servo motor being fixedly connected to one end of the rotating rod, a driving frame being fixedly connected to one end of each of the two rotating rods, both driving frames being rotatably connected to the same mixing tank, a collection box being slidably connected to the upper end of the base plate corresponding to the position of the mixing tank, and replacement devices disposed at both ends of the collection box, each replacement device comprising a sliding frame and a sliding block, the two sliding blocks being close to each other. One side is fixedly connected to both ends of the collection box. The two ends of the outer shell are fixedly connected to two sliding frames. The sliding frame has a sliding groove on its surface corresponding to the position of the sliding block. The sliding block has a "T" shaped cross-section. Two abutment rods are fixedly connected to the surface of the sliding block. A mounting base is fixedly connected to one side of the sliding groove. The arc surfaces of the two abutment rods slide through the inner wall of the mounting base. A sliding rod is fixedly connected to one side of the mounting base. The arc surface of the sliding rod slides through the auxiliary plate. Connecting plates are rotatably connected to both ends of the mounting base. Sliding grooves are opened at both ends of the surface of the auxiliary plate. One end of the two connecting plates slides through the inner wall of the two sliding grooves. A mounting rod is fixedly connected to one end of the two connecting plates. A fixing bolt is threaded through the surface of the sliding frame. The arc surface of one end of the fixing bolt slides into the surface of one end of the sliding block.

[0007] The effect achieved by the above components is as follows: by rotating the fixing bolt, its end is disengaged from the sliding block, and the auxiliary plate is pulled to drive the slide groove to slide, so that the connecting plate rotates and drives the mounting rod to disengage from the sliding block, thus completing the unlocking operation between the sliding block and the sliding frame. This allows the collection box to be removed from the base plate, achieving the effect of facilitating quick disassembly and assembly of the collection box and improving the cleaning and maintenance efficiency of the mixer.

[0008] Preferably, a compression spring is fitted onto the arc surface of the slide rod.

[0009] The effect achieved by the above components is as follows: by setting a compression spring, the auxiliary plate is pushed away from the mounting base by its reset elastic force, which enables the auxiliary plate to automatically reset, avoids the mounting rod from loosening, and achieves the effect of improving the locking stability of the replacement device.

[0010] Preferably, the sliding block surface has a slot corresponding to the position of each of the two mounting rods, and the inner wall of the slot is adapted to the arc surface of the mounting rod.

[0011] The effect achieved by the above components is as follows: by opening a slot on the surface of the sliding block, when the mounting rod rotates, its arc surface can accurately engage with the inner wall of the slot, thereby completing the limiting and fixing of the sliding block and preventing the sliding block from accidentally coming out of the sliding slot, thus improving the stability of the collection box after installation.

[0012] Preferably, auxiliary wheels are installed on both sides of the lower end of the collection box, and protrusions are fixedly connected to the other two sides of the lower end of the collection box. Anti-slip pads are fixedly connected to the lower ends of the two protrusions. The anti-slip pads are rubber pads.

[0013] The effects achieved by the above components are as follows: by setting auxiliary wheels and protrusions with anti-slip pads, the auxiliary wheels can reduce frictional resistance when rolling on the base plate, making the collection box move more smoothly; at the same time, the anti-slip pads make elastic contact with the base plate when the collection box is placed in place, which not only prevents the collection box from directly hitting the base plate, but also increases the friction with the base plate, preventing the collection box from accidentally sliding during use, thereby improving the smoothness of the collection box's movement, positioning stability, and protecting the surface of the base plate.

[0014] Preferably, a protective device is installed on one side of the outer casing. The protective device includes two rotating frames, one side of which is fixedly connected to the surface of the outer casing. A rotating shaft is rotatably connected to each rotating frame. A protective net is fixedly connected to the surface of the rotating shaft. One end of the protective net abuts against the outer casing. A driven gear is fixedly connected to one end of the rotating shaft. A driving gear is rotatably connected to one side of the outer casing at the position corresponding to the driven gear. A handle is fixedly connected to the surface of the driving gear.

[0015] The effect achieved by the above components is as follows: by turning the handle, the drive gear is driven to rotate, which in turn drives the driven gear and the rotating shaft to rotate, thereby driving the protective net to rotate around the rotating frame, completing the opening or closing operation of the protective net. This avoids the protective net from obstructing the operation during cleaning or maintenance, and at the same time, it can play a safety protection role during use, thus improving the convenience and safety of the mixer operation.

[0016] Preferably, the arc surface of the handle is provided with a plurality of auxiliary grooves, and the plurality of auxiliary grooves are evenly distributed on the arc surface of the handle.

[0017] The effect achieved by the above components is that by evenly opening multiple auxiliary grooves on the arc surface of the handle, the friction between the operator's hand and the handle can be increased, avoiding slippage during rotation, thus improving the reliability of the protective device.

[0018] Preferably, telescopic rods are fixedly connected to both sides of the outer shell, and buffer plates are fixedly connected to the extended ends of the telescopic rods. The buffer plates abut against the surface of the protective net, and springs are sleeved on the arc surface of the telescopic rods.

[0019] The effect achieved by the above components is as follows: by setting up telescopic rods, buffer plates and springs, when the protective net flips and closes, its surface will first contact the buffer plate and compress the spring. The elastic force of the spring will buffer and slow down the rotation of the protective net, avoiding hard collision between the protective net and the outer shell, thus extending the service life of the protective device.

[0020] In summary, the beneficial effects of this utility model are as follows:

[0021] In this invention, a replacement device is used. Sliding blocks are fixed to both ends of the collection box and engage with the sliding groove of the sliding frame, guiding the collection box into place. The collection box is then removed, and the fixing bolt is rotated to disengage it from the sliding block. Pulling the auxiliary plate through the sliding groove causes the connecting plate to rotate, disengaging the mounting rod from the slot, allowing the collection box to slide out. Replacing the collection box with the compression spring automatically resets and locks the auxiliary plate. Simultaneously, the auxiliary wheel and anti-slip pad ensure smooth movement and stable positioning of the collection box. This device enables rapid assembly and disassembly of the collection box without tools, significantly improving cleaning and maintenance efficiency while ensuring reliable locking.

[0022] In this invention, a protective device is incorporated. Rotating the handle drives the drive gear, which in turn drives the driven gear and the rotating shaft, causing the protective net to smoothly rotate around the frame. An auxiliary groove on the handle increases friction to prevent slippage. When the protective net closes, its surface first contacts the buffer plate and compresses the spring, utilizing the spring's elasticity for buffering and deceleration, preventing hard collisions. This device makes the operation of the protective net effortless, controllable, and provides buffer protection, extending the equipment's lifespan and improving operational safety and convenience. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a partial structural diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the replacement device of this utility model;

[0026] Figure 4 This is a partial structural schematic diagram of the replacement device of this utility model;

[0027] Figure 5 This is a schematic diagram of the protective device of this utility model.

[0028] Figure 6 This is a cross-sectional structural diagram of the protective device of this utility model.

[0029] Legend: 1. Base plate; 2. Outer shell; 3. Mixing tank; 4. Rotating rod; 5. Drive frame; 6. Changing device; 601. Sliding frame; 602. Sliding groove; 603. Sliding block; 604. Abutment rod; 605. Mounting base; 606. Sliding rod; 607. Compression spring; 608. Auxiliary plate; 609. Connecting plate; 610. Sliding groove; 611. Mounting rod; 612. Slot; 613. Fixing bolt; 614. Auxiliary wheel; 615. Protrusion; 616. Anti-slip pad; 7. Protective device; 71. Protective net; 72. Rotating frame; 73. Rotating shaft; 74. Driven gear; 75. Driven gear; 76. Handle; 77. Telescopic rod; 78. Buffer plate; 79. Spring; 8. Collection box. Detailed Implementation

[0030] Reference Figure 1 and Figure 2 As shown, this utility model provides a technical solution: a mixer for activated carbon production, including a base plate 1, an outer shell 2 fixedly connected to the upper end of the base plate 1, a mixing tank 3 provided on one side of the outer shell 2, two driving mechanisms provided on the surface of the outer shell 2, the two driving mechanisms including a rotating rod 4 and a servo motor, both of the servo motors being fixedly connected to the inner wall of the outer shell 2, the output end of the servo motor being fixedly connected to one end of the rotating rod 4, a driving frame 5 being fixedly connected to one end of each of the two rotating rods 4, both driving frames 5 being rotatably connected to the same mixing tank 3, a collection box 8 being slidably connected to the upper end of the base plate 1 corresponding to the position of the mixing tank 3, a replacement device 6 being provided at both ends of the collection box 8, and a protective device 7 being installed on one side of the outer shell 2.

[0031] The specific setup and function of the replacement device 6 and the protective device 7 will be explained in detail below.

[0032] Reference Figure 3 and Figure 4As shown in this embodiment: both replacement devices 6 include sliding frames 601 and sliding blocks 603. The sides of the two sliding blocks 603 that are close to each other are fixedly connected to both ends of the collection box 8. The two ends of the outer shell 2 are fixedly connected to the two sliding frames 601. A sliding groove 602 is opened on the surface of the sliding frame 601 corresponding to the position of the sliding block 603. The cross-section of the sliding block 603 is "T" shaped. Two abutment rods 604 are fixedly connected to the surface of the sliding block 603. A mounting base 605 is fixedly connected to one side of the sliding groove 602. The arc surfaces of the two abutment rods 604 slide through the inner wall of the mounting base 605. A sliding rod 606 is fixedly connected to one side of the mounting base 605. The arc surface of the sliding rod 606 slides through the auxiliary plate 608. Connecting plates 609 are rotatably connected to both ends of the mounting base 605. Sliding grooves 610 are opened at both ends of the surface of the auxiliary plate 608. One end of the two connecting plates 609 is slidably connected to the inner wall of the two sliding grooves 610. Each connecting plate 609 has a mounting rod 611 fixedly connected to one end. A fixing bolt 613 is threaded through the surface of the sliding frame 601. The arc surface of one end of the fixing bolt 613 is slidably inserted into the surface of one end of the sliding block 603. By rotating the fixing bolt 613, its end is disengaged from the sliding block 603, and the auxiliary plate 608 is pulled to drive the slide groove 610 to slide, causing the connecting plate 609 to rotate and drive the mounting rod 611 to disengage from the sliding block 603, thus completing the unlocking operation between the sliding block 603 and the sliding frame 601. This allows the collection box 8 to be removed from the base plate 1, achieving the effect of facilitating quick disassembly and assembly of the collection box 8 and improving the cleaning and maintenance efficiency of the mixer. The arc surface of the sliding rod 606 is fitted with a compression spring 607. By setting the compression spring 607, its return elasticity pushes the auxiliary plate 608 to move away from the mounting seat 605, which enables the auxiliary plate 608 to automatically reset, preventing the mounting rod 611 from loosening and achieving the effect of improving the locking stability of the replacement device 6. The sliding block 603 has slots 612 on its surface corresponding to the positions of the two mounting rods 611. The inner wall of the slot 612 is adapted to the arc surface of the mounting rod 611. By opening the slots 612 on the surface of the sliding block 603, when the mounting rod 611 rotates, its arc surface can be accurately locked into the inner wall of the slot 612, thus completing the limiting and fixing of the sliding block 603 and preventing the sliding block 603 from accidentally coming out of the sliding groove 602. This achieves the effect of improving the stability of the collection box 8 after installation.Auxiliary wheels 614 are installed on both sides of the lower end of the collection box 8. Protrusions 615 are fixedly connected to the other two sides of the lower end of the collection box 8. Anti-slip pads 616 are fixedly connected to the lower ends of the two protrusions 615. The anti-slip pads 616 are rubber pads. By setting the auxiliary wheels 614 and the protrusions 615 with anti-slip pads 616, the auxiliary wheels 614 can reduce frictional resistance when rolling on the base plate 1, making the collection box 8 move more smoothly. At the same time, the anti-slip pads 616 make elastic contact with the base plate 1 when the collection box 8 is placed in place, which not only prevents the collection box 8 from directly hitting the base plate 1, but also increases the friction with the base plate 1, preventing the collection box 8 from accidentally sliding during use. This achieves the effects of improving the smoothness of movement and positioning stability of the collection box 8, as well as protecting the surface of the base plate 1.

[0033] Reference Figure 5 and Figure 6 As shown in this embodiment: the protective device 7 includes two rotating frames 72. One side of each rotating frame 72 is fixedly connected to the surface of the outer casing 2. A rotating shaft 73 is rotatably connected to the rotating frame 72. A protective net 71 is fixedly connected to the surface of the rotating shaft 73. One end of the protective net 71 abuts against the outer casing 2. A driven gear 74 is fixedly connected to one end of the rotating shaft 73. A driving gear 75 is rotatably connected to one side of the outer casing 2 corresponding to the position of the driven gear 74. A handle 76 is fixedly connected to the surface of the driving gear 75. By rotating the handle 76, the driving gear 75 is driven to rotate. The driving gear 75 drives the driven gear 74 and the rotating shaft 73 to rotate, thereby driving the protective net 71 to rotate around the rotating frame 72, completing the opening or closing operation of the protective net 71. This avoids the protective net 71 from obstructing the operation during cleaning or maintenance, and at the same time, it can play a safety protection role during use, achieving the effect of improving the convenience and safety of the mixer operation. The handle 76 has several auxiliary grooves evenly distributed on its arc surface. These grooves increase the friction between the operator's hand and the handle 76, preventing slippage during rotation and improving the reliability of the protective device 7. Telescopic rods 77 are fixedly connected to both sides of the outer casing 2. A buffer plate 78 is fixedly connected to the extended end of the telescopic rod 77, abutting against the surface of the protective net 71. A spring 79 is fitted onto the arc surface of the telescopic rod 77. By using the telescopic rod 77, buffer plate 78, and spring 79, when the protective net 71 is flipped closed, its surface first contacts the buffer plate 78 and compresses the spring 79. The spring force of the spring 79 buffers and slows down the rotation of the protective net 71, preventing a hard collision between the protective net 71 and the outer casing 2 and extending the service life of the protective device 7.

[0034] Working principle:

[0035] When using this device for activated carbon production mixing, the activated carbon raw materials and additives are first added into the mixing tank 3 in proportion. The drive mechanism is then started, and the servo motor drives the rotating rod 4 to rotate, which in turn drives the drive frame 5 to rotate, causing the mixing tank 3 to tumble and achieve uniform mixing. During the mixing process, the protective device 7 is in the closed state, and the protective net 71 covers one side of the outer shell 2 to prevent operators from accidentally touching the rotating parts and to ensure production safety.

[0036] After mixing and material discharge, a large amount of mixture will accumulate in the collection box 8. To clean the collection box 8, first rotate the fixing bolt 613 so that its end exits the insertion hole on the surface of the sliding block 603, releasing the axial lock on the sliding block 603. Then push the auxiliary plate 608, moving it closer to the mounting base 605. During this movement, the connecting plate 609 will rotate, causing the mounting rod 611 to slide out of the slot 612. The sliding rod 606 guides the movement of the auxiliary plate 608. At this point, the sliding block 603 is unlocked, and the operator can pull the collection box 8, along with the sliding block 603, out of the base plate 1 along the sliding groove 602. The auxiliary wheels 614 on both sides of the lower end of the collection box 8 roll on the base plate 1, greatly reducing frictional resistance and making the pulling process smoother and easier. After the collection box 8 is completely removed, its interior can be thoroughly cleaned.

[0037] After cleaning, push the auxiliary plate 608 to open the two mounting rods 611. Then, align the sliding blocks 603 at both ends of the collection box 8 with the sliding grooves 602 on the sliding frame 601 and push it in until the collection box 8 reaches the predetermined position. At this time, the anti-slip pad 616 makes elastic contact with the base plate 1, which not only buffers the impact but also increases friction to prevent the collection box 8 from sliding. After the collection box 8 reaches the predetermined position, release the auxiliary plate 608. The compression spring 607 will push the auxiliary plate 608 to move away from the mounting base 605. When the auxiliary plate 608 moves, it drives the connecting plate 609 to rotate, causing the two mounting rods 611 to lock in the slots 612. At the same time, tighten the fixing bolts 613 inserted into the ends of the sliding blocks 603 to complete the double locking. The entire disassembly and assembly process requires no additional tools, is quick and convenient, and effectively improves the efficiency of equipment maintenance.

[0038] When mixing is complete and the interior of mixing tank 3 needs to be cleaned, the operator holds the auxiliary slot on handle 76 and turns handle 76 clockwise. Handle 76 drives the drive gear 75 to rotate, and the drive gear 75 meshes with the driven gear 74, causing the rotating shaft 73 to rotate within the rotating frame 72, thereby driving the protective net 71 to flip upward and open. After completing the internal operation, turning handle 76 counterclockwise will close the protective net 71. During the flipping process, the surface of the protective net 71 will first contact the buffer plate 78. The buffer plate 78 compresses the spring 79 and drives the telescopic rod 77 to retract. The elasticity of the spring 79 buffers and slows down the rotation of the protective net 71, allowing the protective net 71 to stop smoothly in the open position, avoiding a hard collision between the protective net 71 and the outer shell 2. At the same time, the telescopic rod 77 ensures the stability of the buffer direction, playing a safety isolation role.

[0039] In summary, this mixer for activated carbon production solves the problems of inconvenient cleaning and maintenance of the collection box 8 and easy collision damage to the protective net 71 by the synergistic effect of the replacement device 6 and the protective device 7. The device is compact, easy to operate, and safe and reliable, significantly improving the ease of maintenance and operational safety of the mixing equipment during activated carbon production.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A mixer for activated carbon production, comprising a base plate (1), characterized in that: The upper end of the base plate (1) is fixedly connected to the outer shell (2). A mixing tank (3) is provided on one side of the outer shell (2). Two driving mechanisms are provided on the surface of the outer shell (2). Each driving mechanism includes a rotating rod (4) and a servo motor. Both servo motors are fixedly connected to the inner wall of the outer shell (2). The output end of the servo motor is fixedly connected to one end of the rotating rod (4). One end of each of the two rotating rods (4) is fixedly connected to a drive frame (5). Both drive frames (5) are rotatably connected to the same mixing tank (3). A collection box (8) is slidably connected to the upper end of the base plate (1) at the position corresponding to the mixing tank (3). Both ends of the collection box (8) are provided with replacement devices (6).

2. The mixer for activated carbon production according to claim 1, characterized in that: Both replacement devices (6) include a sliding frame (601), a sliding block (603), and an auxiliary plate (608). The two sliding blocks (603) are fixedly connected to the two ends of the collection box (8) on their respective sides. The two ends of the outer shell (2) are fixedly connected to the two sliding frames (601). A sliding groove (602) is provided on the surface of the sliding frame (601) corresponding to the position of the sliding block (603). The cross-section of the sliding block (603) is "T" shaped. Two abutment rods (604) are fixedly connected to the surface of the sliding block (603). A mounting base (605) is fixedly connected to one side of the sliding groove (602). The arc surfaces of the two abutment rods (604) slide through the inner wall of the mounting base (605). A sliding rod (606) is fixedly connected to one side of the mounting base (605). The arc surface of the sliding rod (606) slides through the auxiliary plate (608). Both ends of the mounting base (605) are rotatably connected to connecting plates (609). Both ends of the surface of the auxiliary plate (608) are provided with sliding grooves (610). One end of the two connecting plates (609) is slidably connected to the inner wall of the two sliding grooves (610). One end of the two connecting plates (609) is fixedly connected to a mounting rod (611). A fixing bolt (613) is threaded through the surface of the sliding frame (601). The arc surface of one end of the fixing bolt (613) is slidably inserted into the surface of one end of the sliding block (603). A compression spring (607) is sleeved on the arc surface of the sliding rod (606).

3. The mixer for activated carbon production according to claim 2, characterized in that: The sliding block (603) has slots (612) on its surface corresponding to the positions of the two mounting rods (611), and the inner wall of the slots (612) is adapted to the arc surface of the mounting rods (611).

4. A mixer for activated carbon production according to claim 2, characterized in that: Auxiliary wheels (614) are installed on both sides of the lower end of the collection box (8). Protrusions (615) are fixedly connected to the other two sides of the lower end of the collection box (8). Anti-slip pads (616) are fixedly connected to the lower ends of the two protrusions (615). The anti-slip pads (616) are rubber pads.

5. A mixer for activated carbon production according to claim 1, characterized in that: A protective device (7) is installed on one side of the outer shell (2). The protective device (7) includes two rotating frames (72). One side of the two rotating frames (72) is fixedly connected to the surface of the outer shell (2). The rotating frames (72) are rotatably connected to a rotating shaft (73). A protective net (71) is fixedly connected to the surface of the rotating shaft (73). One end of the protective net (71) abuts against the outer shell (2). One end of the rotating shaft (73) is fixedly connected to a driven gear (74). A driving gear (75) is rotatably connected to one side of the outer shell (2) at the position corresponding to the driven gear (74). A handle (76) is fixedly connected to the surface of the driving gear (75).

6. A mixer for activated carbon production according to claim 5, characterized in that: The handle (76) has a plurality of auxiliary grooves on its arc surface, and the plurality of auxiliary grooves are evenly distributed on the arc surface of the handle (76).

7. A mixer for activated carbon production according to claim 5, characterized in that: Telescopic rods (77) are fixedly connected to both sides of the outer shell (2). A buffer plate (78) is fixedly connected to the extended end of the telescopic rod (77). The buffer plate (78) abuts against the surface of the protective net (71). A spring (79) is sleeved on the arc surface of the telescopic rod (77).

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